Compressor



Sept. 29, 1925.

J. H. DENNEDY 4 COMPRESS OR Filed Dec. l0. 1921 INVENTOR. Jamai/ efmedy.

By K,

A TTORNE Y.

u To all i concern:

l. others skilled in "the followingto be a full, clear,

Paieniedsepefze, 1925.Y

:uns n. DENNEDY, or DETROIT, MICHIGAN.

omrimsson. A

Application mea neember 1.o, 1921'. 'serial` 1ro. 521,426,

Be it known that I, JAMES H.'DENNEDY, a citizen of the United States, residing .at Detroit, county of Wayne, State of Michi;y gan, have inventeda certain new andJ'usefu Improvement in Compressors, andv declare and exact description yof the same, such as will enable the art to which it pertains to make and use the same,` reference -being had tothe accompanying drawings,

which form a part `of this specification.

This invention relates to/compressors and the object ofthe invention is to provide an improved discharge vvalve for a compressor which' is entirely automatic in operation and of f comparatively cheap construction. A

. further object of the invention is tovprovide a discharge vchamber for a compressor` con'tainingthe vdischarge valves for the cyl# inders of the compressor, the said ychamber also havin a discharge port'and being provided wit bailles between the discharge ports for the cylinders and discharge portfor thechamber. Another' object of the invention -istol provide a quick actiondisfcharge valve for-compressors embodying a leaf spring adapted to automatically open are attained is shown in the accompanying lblown away fromthe valves during atacertainJ pressure and automatically and lrapidly 'close when the pressure is decreased.- A vstill furtherobject of,` the invention is to provide a discharge valve for a compressor adapted lto retain .a quantity of oil about the discharge-valves, the said `oil vbeng 1scharge ofthe air and the saidv oil aiding in sealing the discharge valves when closed and preventing ingress of air into the'cylinders. These objectsand the several'novel yfeatures of the invention are hereinafter more lfully described and claimed ,and the preferred form of construction bywhich these objects drawings in which-.- l

Fi Y. 1 is a section througha `compressor' -provlded with a discharge chamber and dis-V charge valves embodying in invention. Fig. 2 is an enlarged section through one of the discharge valves and adjacent portions of the dschargechamber.

Fig: 3' is-a plan view 'ofthe discharge valves. I v Fig. 4 is a reduced. section taken on line 4--4 of Fig. 2.

., Fig. 4, the shafts of y The compressor asshownin Fig. 1 com? prises-a crank case 1m which a crank shaft 2fis rotatably mounted. A pair of connect'- i'ng rods'4 are provided each having a bearllng on the crank shaft ,2 and each being connected at the upper end to a piston 5. '.Ihese pistons are reciprocably mounted 1n a pair ofcylinders 6 within a casing 7 lto whichV an air intake line is connected, the

said casing providing a chamber 8 through which air may pass to the intake ports 9 of the cylinders. The/pistons 5 are each provided with an .automatic valve and are fully described and claimed in another application, SerialNo. 521,426, iled by me December 10, 1921. These pistons on the upward `stroke are adapted to close the piston valve and compress the air within the cylinder and on the ldownward stroke are ada ted to open the piston valve and admit lcsh air intov the cylinder. .A plate 10 is provided across the upper end of the cylinders' and is secured in place between the head or discharge chamber 11 of the compressor and the casing 7-`by bolts 12. This plate. 10 is provided with an aperture 13 oentrally'over each cylinder and a valve member 14 isv made a press it in each aperture, the said members. 14 being each provided with a flange 15. limiting the extent of .insertion thereof into the apertures 13. Each mem-y -ber 14 as shown in Fig. 2 is provided with an upper face which is ground on a radius to p rovide -a valve seat. The discharge valve consists 'of three leaves 16, 17 and 18, the

leaf 16 being the shortest, the' leaf 17 being longer and the leaf 18 being the longest as shown in Fig. The leaves 16 and 17 are spring Vsteel andthe leaf 18 is phosphor bronze and is provided with a face. adapted to t the groun face ofv the round lower lmember 14. Each of the spring leaves 16, ,u

17 and 18 as shownin Fig. 3 are provided with a notch 19 on -one side and notch 20 on L the opposite side to receive the bolts 21/and 22 shown-in Fig. p alignment. A cross member 23 1s positioned beneath the leaves to provide a seat therefor and a cross member 24 is positioned-over the same and. the'bolts 21 and 22fare: i117- i. Y

serted through apertures provided in' the ends ofthe cross members 23 and 24 and are threaded into the plate 10 as shown in notches 19 andv 20 of the s ring leaves.

4 which hold the leaves in the bolts 21 and 22 en- 11o' fbindingly, secured together at the center and ,v

the ends thereof extend over theN rhasxchargeA apertures 25 provided-in the member 14. The upper ends of the members 14 and thev upper face of the member 23 are all ground lon a common radius and the spring leaf 18 which is phosphor A'bronze is adapted to seat 'Y on the members 23 and 14 and closethe discharge aperturesjfor the cylinders. When the leaf 18 is secured -in place the members 14 deflect the ends Vof the said leaf upwardly so that the leaf is always under an initial tension which causes it toclose rapvalve.

I 'said bailles' and due to t idly after'being opened. The leaves'16 and 17 are so .proportioned that the pressure which they exert on the leaf 18 causes it to take the form of a true arc andthus closely lit the arcuate' valve faces onthe members 14 and provide a ractically leak proof VA series of alilesare provided in the head or discharge chamber of the compressor comprising a baille 26 on each sideand a baille 27 inthe center Vhaving an opening 28 therethrough, the discharge or pressure line'- 29 being connected to the disseal for'the discharge valves preventing airv from entering the cylinder throughthe discharge valves when closed. f

InY operation the crank shaft 2 is rotated which imparts a reciprocating motion to the connecting'rods and by means of the connecting rods 4 the pistons 5 are reciprocated. Upon each upward stroke of the pistons the air. in the cylinders 6 is compressed until suliicient to overcome the resistance of the spring leaves 16, 17 and 18 of the discharge Valves, thus opening the discharge valves and allowing the compressed air to passV through the apertures 25 and through the discharge hamber 11 into the discharge line 29. As t e'. discharge valve is opened the compressed air blows the oil away from the L openings 25` so thatthe oil -does not return n of the to the cylinders and, when the dischar valve .is closed during the downward stro e iston, the oil acts asa seal prevent? ing lealgage of air about the' discharge valve. On-the downward stroke of the piston the p' .valve is opened as shown at the left of 1 allowing fresh air to enter the cylin ers 6 by the vacuum produced therein and onv the next upward stroke of the piston A From the foregoing description, it be-v comes evident that the device is very simple and eicient in operation, is entirely auto- Amatic, of 'cheap construction and conseuent low-manufacturing' cost, will not Yet tdnt of order and provides a device .whh accomplishes the objects described. Y

Having thus fully describedV my invention, its utility and mode ofA operation, Vwhat I claim and desire to secure by Patent of the United States i 1. The combination in a compressor of a pair of spaced cylinders for reciprocably mounting respectivepistons, a plate constituting a common closure for the ends of said cylinders,A aced discharge apertures in said plate Sibr the respective cylinders, anannular bo sed-in each ofV said apertures detacha ly but non-ro-V said plate, said bosses` tatably constituting passages for said cylinders and having en faces ground on a common curve, a plurality of spring leaves forming a valve for eo-operating A at their ends with Ysaid faces' to close said paagea and means for clamping said leaves 'intermediate their Vends 'to said plate for holding said laminated valve under tension against-said L 2. In a discharge valve for compressors, the combination of a pair of aced valve seatsconstituting passageways or the 'lluid compressed, said'seats concave on a common curve, a plurality ofleaf springs disposed on said seat, that Vnearest the seat constituting at its respective ends the valve closure for said seats, a pair gof, spaced screws extending at the respective sides of said springs and intermediate their ends, said leaves at their respective sides provided with slots along which portions of said screws extend forV preventing longitudinal and transverse movement of `said leaves, and a clamping member co-operating with said screws to clamp said leaves against said seats. v

In testimony whereof I sign this specilication. Y

JAMES EDENNE'DY. 

